低频大摆幅基础运动对滑动轴承-转子系统动力学特性的影响  

Effects of low frequency and large swing base motion on dynamic characteristics of sliding bearing-rotor system

作　　者：张文卓 李明[1] 韩永超 ZHANG Wenzhuo;LI Ming;HAN Yongchao(Department of Mechanics,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]西安科技大学力学系,西安710054

出　　处：《振动与冲击》2021年第7期81-88,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(11972282);陕西省自然科学基金重点项目(2018JZ1001)。

摘　　要：考虑了低频大摆幅基础运动及转子在轴瓦内倾斜而产生的非线性油膜力矩等因素,基于拉格朗日方程建立了滑动轴承-转子系统的动力学模型。采用数值方法研究了基础运动对该系统非线性动力学特性的影响。结果表明:转子系统第一次失稳后其动力学分岔特性出现复杂的上下两支拟周期运动,并且第二次出现失稳的转速有所提高;在转子转速较高时,转子的振幅急剧增大,且在拟周期阶段就已经碰触轴瓦内壁而未能过渡到混沌状态。最后讨论了基础运动的摆动频率和幅值变化对系统动力学特性的影响。上述结论有助于认识低频大摆幅基础运动下滑动轴承-转子系统的运动规律。Considering factors,such as,base motion with low frequency and large swing and nonlinear oil film moments caused by tilting of rotor in bearings,the dynamic model of a sliding bearing-rotor system was established using Lagrange equation.Then,effects of base motion on nonlinear dynamic characteristics of the system were studied using the numerical method.The results showed that after the rotor system loses its stability for the first time,its dynamic bifurcation characteristics have two-branch of upper and lower complex quasi-periodic motions,and the rotating speed during the system losing its stability for the second time rises;when the rotor speed is higher,the rotor’s vibration amplitude increases sharply,and it reaches inner wall of bearing bush in quasi-periodic stage and can’t transit to chaotic state;effects of swing frequency and amplitude variation of base motion on dynamic characteristics of the system were discussed;the above conclusions are helpful to understand motion laws of sliding bearing-rotor systems with low frequency and large swing base motion.

关 键 词：低频大摆幅 基础运动 滑动轴承-转子系统 非线性动力学特性 

分 类 号：O322[理学—一般力学与力学基础]